Baader Planetarium BDS-RT 2" Diamond Steeltrack Focuser for Refractors Telescope

• Baader Diamond Steeltrack (BDS-RT) for Refractors with 80 mm focus travel • Minimum height (as supplied - incl. 2" clamp): 78 mm • Minimum height (with optional S58 direct-thread adapters): 65 mm • Focuser weight (as supplied - incl. 2" Klemme): 1.160 g (40.9 oz) • Adapters available or under development to fit a wide variety of refractor telescopes Drive System • True diamonds form a micro-geared high precision drive system never accomplished before • In comparison to conventional crayford or rack & pinion drives, this micro-geared movement has zero backlash, zero cogging and zero flexure • Diamond Steeltrack 2" focusers lift a payload of 6kg (13 lbs) straight up, without slipping, without excessive bearing preload (bearing preload can be increased further if necessary) • Bearing system utilizes unbreakable Instrument Grade Roller-Bearings instead of simpler Ball Bearings - handles higher loads with greater rigidity and accuracy. No Teflon-pads anywhere • 1:10 Stainless Steel fine-focus mechanism, ready for attachment of the optional Diamond Steeldrive temperature-compensating motor drive system • Detachable drive block assembly is reversible for right hand or left hand fine-focus operation and for attaching the Diamond Steeldrive motor block • Shortest possible mechanical design achieves optimum balance between focuser height (backfocus) and rigidity requirements • Zero shift locking knob to precisely stop any movement without affecting optical axis adjustment Clamping System • S58 Dovetail ring-clamp built into focusing tube for accepting optional T-2 / M48 / M68 and other S58 direct-thread adapters to enable direct thread connection of accessories and cameras without 2" clamp • 2" eyepiece clamp with hardened bronze clamp ring (length of clamp: 12.5mm / 1/2") included as standard • Optionally available 2" Baader Clicklock-clamp w. integrated S58 dovetail (added length: 16mm / 5/8") • Two auxiliary threads (M60x1 and M55x0,75) cut into the RT & NT focusing-tube for attachment of dedicated field flatteners or focal reducers/correctors Focusing Drawtube • Each bearing individually adjustable for precise alignment of mechanical vs. optical axis • Ultra-hard subzero coated bearing races precision milled and much harder than anodizing or stainless steel • Oversized 55mm inner clear diameter, to prevent vignetting, with anti-reflection knife-edge baffles